Die spotting and tryout press



July 8, 1941. c. c. RICHARD EIAL DIE SPOTTING AND TRYOUT PRESS 5Sheets-Sheet 1 Filed Aug. 10, 1938 IIIII llllll July 8, W41. c. c.RICHARD EIAL DIE SPOTTING AND 'IRYOUT 'PRESS 5 Sheets-Sheet 2 Filed Aug.10, 1938 MEL) ATTORNEY.

Juiy mm c. c. RICHARD ETAL.

DIE SPOTTING AND TRYOUT PRESS IHHHHHNHI l .ik N

5 Sheets-Sheet 3 11||||| IILF Filed Aug. 10, 1938 m. 0 T. m V. m C 7 m eC C /fforo July 8, 1941. c. c. RICHARD ETAL DIE SPOTTING AND TRYOUTPRESS Filed Aug. 10, 1938 5 Sheets-Sheet 4 Filed Aug. 10, 1938 5Sheets-Shee t 5 flw HfA .r f m Q .2 Z w 0 5 z m. w lrl r i .0 8 m a 7 qa 5 a a 4 0 s 7 4 M o 7 7 6 w a you. J A: r. 7 s a a Q n W l 6 mm 5 a 8v 7 6 M M w/ 7 5 2 7 a m 4 2 6 3 8 Patented July 8, 1941 iJNiTED DIESPOTTING AND TRYOUT PRESS corporation of Michigan Application August 10,1938, Serial No. 224,146

8 Claims.

This invention relates to die spotting and tryout presses, the objectbeing to provide a new and unique structure for the purpose wherein adie is carried by a movable table to a position beneath the ram whichcarries the complementary die for spotting or tryout purposes, orcarries the first named die from such position beneath the ram to alocation permitting workmen to chisel, grind, file or otherwise workupon the die surfaces without necessitating the Workmen to occupycramped and dangerous positions between the complementary dies.

In the following description, it is generally assumed that the ramsupports the male die commonly known as the "punch and the tablesupports the female die commonly known as the die but it is to beunderstood that the die parts may be reversely positioned in thespotting and tryout operations.

In presses for the formation of sheet metal par-ts, it has heretoforebeen the practice to mount the punch on a movable ram and mount the dieon a bolster plate fixed to the bed in vertical alignment with thepunch. The cooperating surfaces of the die parts must match exactly inorder that the metal formed thereby should be perfectly smooth in itscontour. It is a troublesome matter, in the former presses utilized forthis purpose, to assemble the die parts in position in the press due tothe necessity of having to mount the die set in the press by use of acrane, jacks, skids or other means consuming considerable time and laborand tying up expensive crane equipment that could normally be used forother purposes and further, there has previously been considerabledifficulty in properly positioning the punch and die in the press inrespective attachment to the ram and bolster plate.

Our new and improved structure avoids such laborious operation and thetime consumed thereby in the following manner:

The supporting table for the die is arranged to be moved to a positionat one side of its operative position, it being secured directly to thetable and the punch positioned on the die. The table may then be movedto position the die parts beneath the ram and the ram lowered to engagethe punch shoe. The punch is then secured to the ram leaving the dieattached to the table. A feature of the invention therefore resides inthe provision of means for moving the table and die carried thereby fromand to operative relation with the punch carried by the ram. Thispermits operation on the face Of the die by workmen in trueing thesurface thereof to conform to the surface of the cooperative punchengageable therewith and the mounting of the dies in the press in theirrespective rela-.

v tionships is accomplished more readily andat less labor cost than ispossible with previous presses. v

A further feature of the invention is involved in the mechanism formoving the ram 'to'bring the punch to surface contact with the die inwhat is known as the "spotting operation and in which the face of thepunch is coated with a colored pigment and when the two diesare insurface contact, the high point of the die will be colored by thecorresponding surfaces; of the punch and this has to be worked downby;han d processes such as chiseling, grinding and filing to secure auniform surface on the cooperating die faces. 1

The last said mechanismisof such character that the ram may be moved ata high speed and; under comparatively low'hydraulic pressure to positionthe punch thereon at a point short of contact with the die and the ramthen moved at low speed to bring the punch to surface con-.

tact with the die in order that the spotting may be accomplished. 1 j

The die parts, when they have been worked down by hand and areconsidered to have},attained practical uniformity in the contactingsurfaces, may then be used in what is known as a tryout operationinorder tofmally determine that the dies are in perfect cooperativerelationship for the forming of sheet metal arti-.

' cles. Such tryou operations require-muchgreater pressure than isrequired in the ."spotting operations. A further feature ofv theinvention therefore resides inthe provision of .con-. trol mechanism forthe ram whereby the punch supported thereby may be moved under highspeed and comparatively low pressure to a point short of contact withthe die on the table and then moved at comparatively low speed to con-.tact with the die under high pressure to form,

' punch, trim, or otherwisetry outthe dieslon sheet metal previouslyinserted therebetween.

n The invention therefore seeks not only to pro.- vide a mechanismpermitting the ready, mountfing of the punch and die in the press butalso providing a structure wherein the danger to the; workmen, whoformerlyhad portions or all of the body in hazardous positions between Vthe. punch and die parts in the finishing'of the surfaces, may nowperform this finishing operation with the die withdrawn from operativerelation with the punch carried by the ram, and thus the surface isreadily accessible for any work to be performed thereon. This results ina great saving in that the die can be moved rapidly to or from thenon-operative position to the subsequent die spotting position as manytimes as may be necessary to complete the spotting and tryoutoperations, until the entire surface has been finally formed, it beingevident that the finishing of the die surface can be more easily andrapidly performed if the workmen have greater freedom of body movementsand better access to the surface to be shaped in conformity to thepunch.

The operation of the press is preferably by use of oil pressure and byelectrical control thereof for causing operation of the die parts,either in the vertical movement of the punch in respect to the die or inthe movement of the table carrying the die to and from its operativeposition in respect to the punch, all as is hereinafter more fullydescribed and claimed.

A die spotting and tryout press embodying our invention in its preferredform is shown in the accompanying drawings in which Fig. 1 is a frontelevation showing our improved press, the punch and die being shown indotted lines indicating the open and the closed position thereof.

Fig. 2 is a plan view thereof partly in section to show a detail of theconstruction.

Fig. 3 is a side elevation taken from the right hand side of Fig. 1.

Fig. 4 is a vertical section taken on line 4-4 of Fig. 1 and showing thetable operating cylinder in full lines.

Fig. 5 is a section taken on line 5-5 of Fig. 1.

Fig. 6 is a section taken on line 66 of Fig. 2 showing the means forlocking the movable table in its operative relation with the punchcarried by the ram.

Fig. 7 is a diagram showing the hydraulic and electrical circuits forcontrol of the mechanism.

Fig. '7 is a supplementary diagram showing hydraulically controlledmeans for setting the brake and releasing the table lock.

Fig. 8 is a detail in elevation showing the selector lever and controlbuttons for the electric circuit.

The press is shown in one of its possible forms in front elevation inFig. 1 and consists of the vertical standards I and 2 which are ofhollow form and a base 3 and a crown 4. The ram 5, to the lower face 6of which is secured the punch I, is shown by dotted lines. On the base 3is mounted a table 8 which carries the die 9 shown by dotted lines andthis table is movable to withdraw the die 9 from beneath the punch I.

The ram 5 has the opposite end portions l and i l extending into thehollow columns I and 2 and is attached to the upper end of the pistonrods l2 and I3 respectively which operate in the respective cylinders I4and I which is intended to apply pressure to either the lower or theupper side of the pistons 16 and I! respectively, shown more clearly inFig. '7 and will thus move the ram upwardly or downwardly dependiiigupon which side of the piston the pressure is applied. As fluid issupplied to each of the cylinders simultaneously, either on the upper ork lower side, the pistons will move and maintain the ram with its lowerface in a horizontal plane and to insure the maintenance of the ram inexactly a horizontal plane, there is a vertical rack l8 carried by thecolumn I and a similar rack I9 carried by the column 2. A shaft 20 iscarried by the ram and extends through a bearing 2| and 22 adjacent itsopposite end and this shaft carries end pinions 23 and 24 engaging inthe respective racks l9 and I8. The gears and racks provide a constantsurface contact which is a well known form of rack and pinion structureand the shaft secured to the ram serves to maintain the ram with itslower face 5 always in a horizontal plane at any point of its movementin a vertical plane, and it is a feature of this invention to provide ameans for hydraulically moving the ram and for maintaining the ram Withits face in a horizontal plane during movement under hydraulic pressure.

As will be understood more clearly from Figs. 3 and 4, the base 3 has aportion 25 extending from the front of the machine and at the extremeforward end has a pulley 28 on one side and 21 on the other side and hassimilar pulleys at the rear end as indicated at 28 in Figs. 2 and 4.

There are thus two pairs of pulleys on each side of the frame portion 25and the rear side of the machine and on each side of the machine is abelt 29 for each pair of pulleys and these belts return on the underside of the machine through a sheet metal channel 30 on each of theopposite sides of the extension 25 through which the belts run. Eachbelt is attached to the table at the forward edge at 3| and at the rearedge at 32. These belts coupled to the table serve as an endlessprotection for the ways 33 on which the table 8 slides from its positionunder the ram to and from its position to be worked on. The table ismoved on the extension 25 and portion thereof that extends between thecolumns I and 2 and is slidably supported in respect to such extensionon ways 33 built as a part of the base 3 shown in Fig. 6.

The table is moved outwardly from position beneath the ram or from theoutward position to beneath the ram by means of a hydraulic cylinder 36which has a piston therein (not shown) but to the opposite sides ofwhich liquid under pressure may be applied to move the table in thepredetermined direction.

The piston rod 31 extends from the forward end of the cylinder 36 and issecured to a depending fiange and through an aperture in the portion 38on the table and securely attached thereto as by a nut 33. Pressureapplied to the rear of the piston in the said cylinder will move thetable from the position shown in Fig. 4 outwardly from beneath the ram 5and into a position readily accessible for workmen to true the surfaceof the die to shape in proper conformity with the surface of the punch 1carried by the ram. By this structural arrangement, the workmen are inposition to freely move about in the operation of trueing the diesurface without necessity of cramping their bodies between the upper andthe lower die as has heretofore been the practice, where the lower dieis fixed in position beneath the ram. There is less danger to theworkmen also in thus removing the lower die to a position from beneaththe upper die, as accidental release of the upper die causing it to movedownwardly, could result in injury to the workmen.

In the construction here shown, there is provided a brake shoe 48 andcompanion shoe 4|] on a wheel 4! secured to the shaft 20 on the forwardface of the machine shown in Figs. 3 and 7. There is a similar shaft 20on the opposite face of the machine as will be clearly understood fromthrough pressure regulating valve 72 and line 13 Fig. 3 which likewisehas pinion gears thereon at its opposite ends, as on the shaft 20, whichride in similar racksv (not here shown), and, as previously stated, thegears and racks maintain the ram with its lower face constantly in ahorizontal plane in its upward or downward movement.

The brake is utilized to hold the shaft 29 from rotation and is clampedto the wheel by means of an arm 42 to a clamping means indicatedgenerally at 43 in Fig. 1. The arm is swung by hydraulic pressure, beingattached to a piston in a cylinder 44 and the arm moved by pressure ofspring 42 in one direction to tighten the brake shoe and by hydraulicpressure in cylinder 44 in the opposite direction to release it.

It is desirable that the table be accurately fixed in position whenmoved to beneath the ram for cooperative relation therewith. Thismechanism is shown in section in Fig. 6 and consists of a hydrauliccylinder 4'! (Fig. l) with piston rod 52 mounted on the base 3 of themachine and at the left side of the path of movement of the table whichhas the slide 35 engaging a complemental slide 33 on the base. A flangeof the table 8 is formed with an aperture in which is secured a hardenedmember 48 having a coned recess 49 to receive a coned end on the lockpin 59. This pin is movable in a recess provided in a block secured tothe base and is attached to the piston rod 52 of the hydraulic cylinder41, shown in Fig. '7. It is not essential that the lock pin be movedhydraulically as hereinafter described, as other mechanism mayconveniently be employed for the purpose, the essential point being thatat the time the table is moved to beneath the ram it is required to becentered in respect thereto to maintain the die parts carriedrespectively by the ram and the table in alignment for registration.

It is to also be noted from Fig. 5, that the ram carries a bracket 53 onwhich is a contact element 54 which may engage a companion element 55 or51 which are locked in any desired position on a bar 58 by means of a.screw 59 for each element 55 and M. The contact of the element 54 withone of the elements 55 or 51 determines the distance through which theram is moved.

The hydraulic and electric systems, shown diagrammatically in Fig. 7,include an oil or liquid reservoir 55 in the base of the column 2 and anelectric motor 46 and pumps operated thereby positioned in the base ofthe column l.

Obviously, the parts operable by hydraulic pressure must be entirelywithin the control of the operator as is also true with the electriccircuits required for the various operations. In order that a completeunderstanding of the manner of control of the press and its operationmay be had, we have shown the hydraulic and electric circuitsdiagrammatically in Fig. '7 in which the ram 5 is shown in its properrelation with the cylinders 14 and I5 while the table 8, for the purposeof clarity in showing the circuits, is offset in respect to the ram.

The hydraulic system includes the oil reservoir 45, the electric motor46 which drives the high capacity low pressure pump 69 and the lowcapacity high pressure pump 51 The high capacity pump dischargingthrough the line 65 to the pressure regulating valve 65 and thencethrough the conduit 6'! through the three-way unloading valve 68 andcheck valve 59 through the conduit 19. The high pressure, low capacity,pump 6| discharges through the conduit H and which joins the line 10prior to its connection with the manually operated four-way valve 14.The four-way valve 14 is controlled by a lever 15 shown in Fig. 8 whichmay occupy a mid position or an upper or a lower position in the slot16. With the lever I5 in the upper position, the oil flow is directedthrough the valve 74 to the conduit l1 bypass valve H and thence throughconduit 15 to the solenoid operated four-way valve 18, and by means ofthe actuating solenoids l9 and (hereinafter more fully described)directed to conduit 8| and check valve 82 and flow control valve 9! tothe conduits 83 and 84 which combine the previously split circuit againto form conduit 85 which leads to both the under sides of the piston l6and I! to lift the ram, or from the valve 18 through conduit 89 whichleads-to the upper side of the pistons l6 and Il to lower" the ram fortryout or spotting purposes. In the upper position of the operatinglever 15, the valve 14 directs the oil under pressure through theconduit 11. In the lower position, the oil flow is directed through thevalve 74 to the conduit 81 bypass valve 8'! and conduit 81 to thesolenoid operated four-way valve 88 through conduits 89 or 90, dependingupon the selection as hereinafter described, to actuate the piston inthe cylinder 36 to move the table 8 in or out. Thus with the lever 15 inits upper position, the application of oil under pressure to the oneside or the other of the pistons IE or ll raises or lowers the ram, andin its lowermost position moves the table in or out, depending upon theposition of the selector valve and the solenoid operated valves 18 or88.

1 In Fig. 8, the control panel shows several push buttons designated asB .13 13 B and B The electrical diagram in Fig. 7 just below Fig. 8shows the circuit controlled by the push buttons. The input 220-voltcircuit is indicated at A in Fig. '7 and the main power switch is shownat 9|. The

two lines 92 and 93 lead to the electric motor 46.

Branching off from the lines 92 and 93 are two lines, one line 94leading to one end of the primary coil or transformer 95 and the otherline 96 is common to the various solenoids used in operating the valves68, 18, 9'! and 88. On the low voltage side of the transformer 95 arefive relay coils R R R and R each of which is energized by therespective push buttons B to B inclusive. On the:220-volt side of theprimary are five relay contacts C C C C and 0 7 As heretofore stated, onthe bar 58, there are two limit switches 55 and 51 which regulate thelength of the vertical stroke of the ram in the upward or the downwardmovement and this limitswitch is indicated in two places as 54 in Fig.7.

' The function of the electrical circuit in spotting a die is asfollows:

Assuming, that the punch l is attached to the ram and the die 9 attachedto the table 3 in position for a spotting operation and assuming thatthe'dies are closed at the beginning of the series of operations, thefirst step is to start the electric motor to supply oil under pressureto the system. Then the lever 15 is moved to the up position to operatethe ram. This movement of the valve directs the hydraulic power throughconduit "H and bypass valve I'l to the right side of the piston incylinder 44, exerting pressure thereon and moving it to the leftcompressing spring 2*? and by means of lever 42 releases brake shoes 49and 49 thereby permitting brake wheel il to rotate and the ram to moveup and down freely. Bypass ll is so regulated as to direct the oil flowto cylinder 44 at any predetermined pressure required to compress spring42 before the oil will pass to conduit 71 and thence to solenoidoperated four-way valve 18, in order to assure the release of thisholding brake before the ram is caused to move. It is also to be assumedthat the limit switch 54 is between the stops 55 and 51, the reason forwhich is subsequently described.

In order to raise the ram with the punch attached thereto, the operatorpushes the button B which closes the circuit to the coil R through thenormally closed limit switch 54. When the coil R is energized, the relaycontact C is closed and the solenoid 80 energized setting the valve 18to position to feed the cylinders l6 and I! through the line 8|, andvalves 82 and 9'1 and conduit 85 to the under side of the pistons I6 and[7. So long as the push button B is held closed, oil flows to the underside of the pistons and raises the ram 5. If it is desired to limit theram movement to certain height as a matter of economy in time operation,the up stop 55 is so set that the contacts of the limit switch 54 willbe broken when the ram reaches the predetermined height.

Referring to the l2-volt circuit, when the normally closed limit switch54 is broken, the circuit is also broken to the coil R and therefore therelay contact C is broken and the solenoid 80 is de-energized. The valve18 is spring centered and thus it returns to center, cuts off and locksthe circuit to the cylinders l4 and I5 and stops the vertically upwardmovement of the ram regardless of whether the push button remains heldin contact or not. If it be desired to raise the ram further than thepoint where the'limit switch is opened by the stop 55, the button B ispressed which bridges the limit switch 54 audit is thus possible toraise the ram further by pushing the button B and B at the same time.

The switch B is a four-pole push button type for energizing coil R atthe same time it bridges the limit switch 54. Thus at the same time thepush button B is pressed to raise the ram higher than is provided for bythe limit stop 55, we close the contact C and thereby energize thesolenoids of the valves 68 and 91. This action has the effect ofunloading the discharge of the high capacity pump 60 to return to thetank by way of the unloading valve 68 to the conduit 99 thereby reducingthe speed. This also chokes the outlet in the lower part of thecylinders I 4 and I5 by restricting flow through the valve 91 when itssolenoid is energized. The check valve 82 only permits flow of oil inone direction to the under side of the pistons l6 and H.

The next action is to move the table from beneath the ram to positionthe die to be worked on in shaping its surface to conform exactly to thecontact surface of the punch. Movement of the table is made possible bymoving the lever of valve 14 to the down position in the lower part ofthe slot it of the panel. This directs the flow of oil to the conduit 81and bypass 8'! shown in Fig. '7 to the right side of the piston incylinder 41, setting up pressure to move the piston and piston rod 52 tothe left compressing spring 52 and withdrawing the coned end on lock pin50, thereby releasing table 8 for movement on ways 33 of base 3. Bypassvalve 81* is also regulated to direct the oil flow to cylinder 41 at anypredetermined pressure required to compress spring 52 before the oilwill pass to conduit 81* and thence to solenoid operated four-wayvalve.88, in order to assure the release of the table look before thetable is moved out.

It is readily seen, therefore, that lack of pressure in either or bothlines 11 and 81, due to the unloading feature of valve 14 or the factthe pumps are not supplying oil to the hydraulic system, the springs 42and 52 act to set the ram brake and the table lock. Either of the latteris released by hydraulic pressure being conducted to cylinders 44 and 41from valve 14 according to whether selector lever 15 is set to actuatethe ram or the table.

After release of the table lock, the oil flows through conduit 8'!making pressure available at the valve 88, the button B is pressedthereby energizing the coil R and closing the contact C which energizesthe solenoid I00 of the valve 88. When the solenoid is energized, thevalve 88 is positioned to feed oil under pressure to the conduit 89leading to the rear of the piston in cylinder 36 and opens the conduit95 to the return line 99 and pressure is thus built up at the left ofthe piston in the cylinder 35 and the table 8 is moved outwardly on itsways.

It is to be noted that the invention is not confined to use of ahydraulically controlled brake or table lock as other structures mayconveniently be utilized under the control of the operator to set thebrake and to actuate the table lock mechanism. The hydraulic conduitsl0, l3 and 99 of Fig. '7 are the same conduits TU, 13 and 99 of Fig. 7and thus it will be readily understood how the hydraulic mechanism foractuating the brake and the table lock mechanism may be included in thehydraulic circuits of Fig. 7.

The necessary work may be done on the die part positioned on the table,when the table is in its outer position, after which it is required tomove the table to bring the die thereon beneath and in registration withthe complementary die part on the ram. This is accomplished by pressingthe button B which energizes the coil R and closes the contact C to thesolenoid I 0|. The closing of the contact connects the high pressureconduit 81 with the conduit leading to the cylinder 36 and at the sametime opens the conduit 89 to the return line 99. This applies pressureto the forward side of the piston in the cylinder 35 and moves the tableon its ways to its position beneath the ram which is determined by thestops 98 and is held in position by the hydraulic lock shown in Fig. 6.This lock is engaged due to the repositioning of lever 15 of valve 74 tothe neutral position where the oil pressure is reduced due to the factthat this valve unloads to the tank in this neutral position, therebyreleasing the pressure in cylinder 4'! permtting spring 52 to inject thelocking member so into its rest 48.

Prior to the table being moved to the locked position, the face of thepunch may be coated with a colored pigment and the press is then incondition for the spotting operation in which the ram is moveddownwardly to bring the punch into contact with the lower die. Toperform this operation, the lever 15 is first moved to the up positionto select operation of the ram and as the limit switch 54 is now heldopen by the stop 55, it is necessary to press both the bridge button Band the down button B Closure of the circuits controlled by the bridgebutton B and down button B starts downward movement of the ram as thehydraulic liquid from pump 6| is discharged through line 86 to the upperside of the pistons l6 and I1, and when the limit switch has passed thestop 55, pressure-is 'released on the button B and downward move- 'mentis continued by pressing only the push buttom of these pistons. Thelower stop 51 ispositioned to stop the rapid downward movement of theram 5 a little distance before the punch, carried by the ram, comes intocontact with the die in order that better control may be had of the'actual spotting operation, so, as the ram descends,

the limit switch 54 is opened by the stop 51 which breaks the circuit tothe coil R and deenergizes the solenoid l9 permitting the springcentered valve 18 to stop the flow of oil to and from the cylinders l4and It. To complete the spotting operation and control the speed offurther downward movement of the ram 5, both the push buttons B and Bare pressed bridging the circuit to coil R and energizing coil 19. This,at the same time, unloads the high capacity pump 60 by means of thethree-Way unloading valve 68 and restricts the flow from the cylindersI5 and 15 by means of the solenoid operated flow regulator 97.

It is to be noted that the check valve 69 prevents back fiow of thedischarge from the high pressure low capacity pump SI and since thepressure regulator valve 12 is set for high pressure, a low capacityhigh pressure flow is obtained to operate the ram at the time ofbringing the dies together in the spotting operation. This control ofthe ram in its downward movement permits the making of tryouts with thisarrangement without increasing the capacity of the electric motor at thesame time making it possible to attain speed of operation as is requiredat all times other than that required for the momentary spotting ortrying out operations.

From the above description of the mechanism of the press and of theelectric circuits, it is believed evident that we have devised amechanism and a control for the mechanism through which all the variousobjects and features of the inventionare attained-namely, a press forthe spotting or tryout of dies in the manufacture of the same forcommercial use, the lower die of the pair being movable to positionwhere, after it has been spotted by contact of the upper die and thehigh pointsindicated by the spotting operation,

the workmen are able to cut away the high points by any approved meanswhile the die is in a readily accessible position, without necessity ofthe workmen introducing all or portions of the body between the dies ashas been the previous practice By this means, a much more rapid and safecompletion of the job is accomplished because it is possible to work onthe face of the die, move it to and from position for spotting and againwork the surface of the die at successive intervals until the surfacesof the two dies are in accurate conformity.

After the spotting of the dies has been completed, a piece of work suchas sheet metal, may be introduced therebetween and the dies tried out byforming the piece to thereby determine that the dies function properly.By the arrangement of the parts and by the control of hydrauliccircuits, the press is under perfect control of the operator at alltimes, which includes a high speed movement of the ram from its upperposition toward the lower position where it may be stopped prior toreaching the lower die at which to the function of the valves in thecontrol circuit and an, electric circuit under the operators controlcausing operation of the valves at the desired time.

Having thus fully described our invention, its utility and mode ofoperation, what we claim and desire to secure by Letters Patent of theUnited States is- 1. In a die spotting and'tryout press, a, verticallymovable ram carrying a die, hydraulically actuated means for moving theram a horizontally movable table carrying a complemental die,hydraulically actuated means for moving the table to position the diethereon at one side of the die on the ram to expose the entire surfaceof the table die for a finishing operation by Workmen and for returningthe table to position the die thereon in alignment with the ram die, ahydraulic system for the said hydraulically actuated means, means undercontrol of the operator to supply the hydraulically actuated means ofthe-ram with liquid at low pressure and large volume to produce highspeed of movement thereof, means controlled by movement of the ram tocause cessation of supply of liquid to the companion hydraulicallyactuated means, and means under control of the operator for supplyingthe said hydraulically actuated means of the ram with liquid in lowvolume and under high pressure to thereby cause a slow movement of theram and create a high pressure contact.

' ated valve elements in said hydraulic circuit, and

, under the control of the operator whereby operaan' electric circuitincluding switch elements .tion of any of the hydraulically actuatableelements may be produced at will.

3. In a die spotting and tryout press, a vertically movable ram carryingthe die, a horizontally movable table carrying a complemental die, a,pair of parallel ways on which the table is movable, a pair of flexiblebelts each having its opposite ends connected with the table andrespectively aligned with the Ways whereby, as the table is moved, eachbelt rides in close association with the face of the respective ways tothereby protect the same from accumulation of foreign matter thereon,means for moving the ram toward or from the table in the operativerelationship of the dies, and means for moving the table.

4. In a press, a vertically movable ram for carrying a die part, asupport for carrying a complemental die part, hydraulically controlledmeans for moving the ram toward and from the support, said hydraulicallycontrolled means including a motor driven pump of high capacity and lowpressure, a motor driven pump of low capacity and high pressure, andmeans for controlling operation of said pumps whereby the ram is movedby the high capacity pump through a portion of its travel toward the dieon the support and thereafter moved by the low capacity high pressurepump to bring the die parts to pressure contact.

5. In a die spotting and tryout press, a vertically movable ram carryinga die, a horizontally movable table carrying a complemental die, meansincluding a cylinder and a piston therefor for moving the table towardor from a position with the die thereon in vertical alignment with theram die, means including cylinders and pistons for moving the ram withthe die thereon toward or from cooperative relation with the table die,a hydraulic system for supplying liquid to said pistons and cylinders ofthe ram or table including a source of liquid supply, a pump forproviding liquid under pressure to the hydraulic system, valve mechanismin the said hydraulic system operable to direct liquid under pressure tothe ram or the table cylinders, solenoids for control of the saidvalves, electric circuits for the said solenoids, a selector station towhich the said circuits lead, electric switching mechanism at the saidstation for closing or opening any of the said circuits at the will ofthe operator, a manually controlled means at the said selector stationadapted to direct liquid under pressure to the ram cylinders to raise orto lower the same as determined by the selected switch or in anotherposition to apply liquid under pressure to the table cylinders to movethe table in or out as determined by the selected switch, said manuallycontrolled means preventing application of pressure to move the ram orto move the table,

when the respective other element is being moved.

6. In a die spotting and tryout press, a vertically movable ram carryinga die, a horizontally movable table carrying a complemental die, ahydraulically actuatable means for moving the table with the die thereontoward or from a position in vertical alignment with the ram die, ahydraulically actuatable means for moving the ram and die thereon towardor from cooperative position with the table die, a hydraulic system bymeans of which fluid under pressure is suppliable to the hydraulicallyactuated means for moving the table or to the hydraulically actuatablemeans for moving the ram, and valve means under the control of theoperator to supply liquid in said hydraulic system to the hydraulicallyactuatable means of either the ram or the table while maintaining therespective other liquid pressure applying means inoperative, means forautomatically locking the table from movement when the die thereon is inalignment with the ram die, and hydraulic means forming a part of thesaid hydraulic system for moving the table and automatically releasingthe table for movement prior to application of liquid under pressure bythe operator to move the table from beneath the ram.

'7. In a die spotting and tryout press, a vertically movable ramcarrying a die, a horizontally movable table carrying a complementaldie, selective means under control of the operator for moving the ramvertically or the table horizontally to position the die thereon in orout of alignment with the ram die, automatic means for sustaining theram in any possible vertical position when not being moved andautomatically releasing said ram for movement upon actuation of theselective means to move the same, and selective means for sequentiallymoving the table horizontally with the complemental die thereon toposition the same in vertical alignment with the die on the ram forspotting and tryout operations or to position the complemental die atone side of the ram die to permit loading the complemental die on thetable and reworking of the same subsequent to the spotting or tryoutoperation, automatically operable means for locking the table in thespotting position, and means for releasing the table locking element byactuation of the selective means to position the complemental die at oneside of the ram die.

8. In a die spotting and tryout press, a vertically movable ram carryinga die, a horizontally movable table carrying a complemental die, ahydraulically actuatable means for moving the table with the die thereontoward or from a position in vertical alignment with the ram die, ahydraulically actuatable means for moving the ram and die thereon towardor from cooperative position with the table die, a hydraulic system bymeans of which fluid under pressure is suppliable to the hydraulicallyactuated means for moving the table or to the hydraulically actuatablemeans for moving the ram, and valve means under the control of theoperator to supply liquid in said hydraulic system to the hydraulicallyactuatable means of either the ram or the table while maintaining therespective other liquid pressure applying means inoperative, andhydraulically actuatable means for locking the table from movement whenthe die thereon is in alignment with the ram die, said hydraulic meansbeing a part of the said hydraulic system and automatically releasingthe table for movement prior to application of liquid under pressure bythe operator tomove the table from beneath the ram.

CLEMENT C. RICHARD.

CLIFFORD H. KAIN.

